K/Na Ratio Dependence of the Electrical Properties of [(KxNa1−x)0.95Li0.05](Nb0.95Ta0.05)O3 Lead-Free Ceramics |
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| Authors: | Jiagang Wu Dingquan Xiao Yuanyu Wang Lang Wu Yihang Jiang Jianguo Zhu |
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| Affiliation: | Department of Materials Science, Sichuan University, Chengdu 610064, China
;College of Materials Science and Metallurgy Engineering, Guizhou University, Guizhou 550003, China |
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| Abstract: | (K x Na1? x )0.95Li0.05](Nb0.95Ta0.05)O3 (K x NLNT) ( x= 0.40–0.60) lead-free piezoelectric ceramics were prepared by conventional solid-state sintering. The effects of K/Na ratio on the dielectric, piezoelectric, and ferroelectric properties of the K x NLNT ceramics were studied. The experimental results show that the electrical properties strongly depend on the K/Na ratio in the K x NLNT ceramics. The K x NLNT ( x =0.42) ceramics exhibit enhanced properties ( d 33～242 pC/N, k p～45.7%, k t～47%, T c～432°C, T o?t =48°C, ?r～1040, tanδ～2.0%, P r～26.4 μC/cm2, E c～10.3 kV/cm). Enhanced electrical properties of the K x NLNT ( x =0.42) ceramics could be attributed to the polymorphic phase transition near room temperature. These results show that the K x NLNT ( x =0.42) ceramic is a promising lead-free piezoelectric material. |
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